[Pepper] Wire up append mode writing support of FileIO

content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc

Index: content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
diff --git a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
index 0430b6b35ace40b7fd42d0851945fe06ef0d93f4..0401ae220667b602266d4679f99cf58687dc974e 100644
--- a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
+++ b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
@@ -365,7 +365,7 @@ int32_t PepperFileSystemBrowserHost::OnHostMsgInitIsolatedFileSystem(
 int32_t PepperFileSystemBrowserHost::OnHostMsgReserveQuota(
     ppapi::host::HostMessageContext* context,
     int64_t amount,
-    const ppapi::FileSizeMap& file_sizes) {
+    const ppapi::FileGrowthMap& file_growths) {
   DCHECK(ChecksQuota());
   DCHECK(amount > 0);
 
@@ -373,11 +373,6 @@ int32_t PepperFileSystemBrowserHost::OnHostMsgReserveQuota(
     return PP_ERROR_INPROGRESS;
   reserving_quota_ = true;
 
-  ppapi::FileGrowthMap file_growths;
-  for (ppapi::FileSizeMap::const_iterator it = file_sizes.begin();
-       it != file_sizes.end(); ++it)
-    file_growths[it->first] = ppapi::FileGrowth(it->second, 0);
-
   int64_t reservation_amount = std::max<int64_t>(kMinimumQuotaReservationSize,
                                                  amount);
   file_system_context_->default_file_task_runner()->PostTask(
@@ -463,7 +458,7 @@ void PepperFileSystemBrowserHost::GotQuotaReservation(
 void PepperFileSystemBrowserHost::GotReservedQuota(
     ppapi::host::ReplyMessageContext reply_context,
     int64_t amount,
-    const ppapi::FileSizeMap& max_written_offsets) {
+    const ppapi::FileSizeMap& file_sizes) {
   DCHECK(reserving_quota_);
   reserving_quota_ = false;
   reserved_quota_ = amount;
@@ -471,7 +466,7 @@ void PepperFileSystemBrowserHost::GotReservedQuota(
   reply_context.params.set_result(PP_OK);
   host()->SendReply(
       reply_context,
-      PpapiPluginMsg_FileSystem_ReserveQuotaReply(amount, max_written_offsets));
+      PpapiPluginMsg_FileSystem_ReserveQuotaReply(amount, file_sizes));
 }
 
 std::string PepperFileSystemBrowserHost::GetPluginMimeType() const {